Well the 5.7 that FN makes is a pretty small round and it can defeat some body armor. But I've never heard of a 9mm penetrating standard vests. Most body armor are pretty good against most types of pistol ammo.
I mean, by your logic that the smaller the bullet, it can penetrate armor, then a .22LR can go through anything since it's so tiny.
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"There's a fine line between not listening and not caring...I like to think I walk that line everyday of my life."
Blessed be the LORD, my rock, Who trains my hands for war, And my fingers for battle
Psalm 144:1
“It is always wrong to use force, unless it is more wrong not to.”
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